/*------------------------------------------------------------------------------*\
**   Copyright 2008-2009 Jonhnny Weslley                                        **
**                                                                              **
**   Licensed under the Apache License, Version 2.0 (the "License");            **
**   you may not use this file except in compliance with the License.           **
**   You may obtain a copy of the License at                                    **
**                                                                              **
**       http://www.apache.org/licenses/LICENSE-2.0                             **
**                                                                              **
**   Unless required by applicable law or agreed to in writing, software        **
**   distributed under the License is distributed on an "AS IS" BASIS,          **
**   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   **
**   See the License for the specific language governing permissions and        **
**   limitations under the License.                                             **
\*------------------------------------------------------------------------------*/

package org.scalashell

trait InteractiveShell {

  def prompt(): String

  def incomplete(): String

}

class SimpleInteractiveShell(in: java.io.BufferedReader) extends InteractiveShell {

  def prompt = in.readLine

  def incomplete = prompt

}

trait JLineInteractiveShell extends InteractiveShell with terminal.Renderer {

  def commands: Iterator[Command]

  val historyFile: java.io.File

  lazy val history = try {
      new jline.History(historyFile)
    } catch {
      case _ => new jline.History
    }

  lazy val consoleReader = {
    val reader = new jline.ConsoleReader
    reader setHistory history
    reader setUsePagination true
    reader addCompletor new ShellCompletor
    reader
  }

  class ShellCompletor extends jline.MultiCompletor {

    import scala.collection.mutable.ListBuffer

    var completorList = new ListBuffer[jline.Completor] 
    commands foreach (completorList + _.completor)
    setCompletors(completorList.toArray)
  }

}